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Download pdf 1.1MB - FAUNA Paraguay

Download pdf 1.1MB - FAUNA Paraguay

Download pdf 1.1MB - FAUNA

THE WILSON BULLETIN A QUARTERLY MAGAZINE OF ORNITHOLOGY Published by the Wilson Ornithological Society VOL. 95, No. 3 SEPTEMBER 1983 PAGES 321-504 Wilson. Bull., 95(3), 1983, pp. 321342 THE DISPLAY REPERTOIRE OF THE BAND-TAILED MANAKIN (PIPRA FASCXCAUDA) MARK B. ROBBINS The diversity of mating systems in Neotropical birds is impressive. One family, the manakins (Pipridae), is particularly rich in mating systems; nearly the full gamut is represented among its 51 species (Snow 1979), with most species being promiscuous (Snow 196333, Sick, 1967). This prom- iscuity, with its congregations of brightly colored males at leks, is consid- ered to represent the most highly derived type of mating system (Lack 1968). Presumably, a gradual shift in diet from insectivory to frugivory, emancipating males from nesting duties (Snow 1963b), coupled with the nondefensibility of either resources or female groups may have pre-adapt- ed manakins for evolving a lek mating system (Emlen and Oring 1977, Bradbury 1981). Recently, Bradbury (1981) suggested that the crucial se- lective force in developing lek behavior (given the above conditions) is an increase in female home-range size relative to the size of existing male territories. This may lead to a shift in male strategies from resource de- fense to self-advertisement and with female preference for clustered males will lead to congregations of displaying males at localized sites within a habitat (Bradbury 1981). Although something is known about the courtship behavior of nearly half of the manakins (Snow 1963b, Sick 1967), many have yet to be studied. Due to apparent rapid evolution in this group (Schwartz and Snow 1978), different populations of a species may exhibit unique morphological and behavioral characteristics that make it necessary to study each species under a variety of conditions within its range (Sick 1967). Although the Band-tailed Manakin (Piprafasciicauda) is relatively wide- spread throughout southern Amazonia (Snow 1979), little information ex- ists about its natural history (Sick 1967, Schwartz and Snow 1978). On the basis of morphology and zoogeography, the band-tail is closely related to 321

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